<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="isAllCheck"/>
    </label>
    <span>
          <span>已完成{{completeNum}}</span> / 全部{{todosSize}}
        </span>
    <button class="btn btn-danger" v-show="completeNum" @click="delSelectItem">清除已完成任务</button>
  </div>
</template>

<script>

  import {mapGetters, mapActions} from 'vuex'

    export default {
      name: "TodoHeader",
      computed: {
        ...mapGetters(['completeNum', 'todosSize']),

        // 设置双向绑定监听
        isAllCheck: {
          get () {
            return this.$store.getters.isAllCheck
          },
          set (value) {
            this.$store.dispatch("selectAll", value)
          }
        }
      },
      methods: {
        delSelectItem() {
          this.$store.dispatch('delSelectItem')
        }
      }
    }
</script>

<style scoped>
  .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }

  .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }

  .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }

  .todo-footer button {
    float: right;
    margin-top: 5px;
  }
</style>
